Re: [PATCH] waitid system call

[Roland McGrath <roland@redhat.com>]

> Is it really necessary to check the exit code after each put_user?
> 	if (!retval && access_ok(VERIFY_WRITE, infop, sizeof(*infop)))) {
> 		retval = __put_user(0, &infop->si_signo);
> 		retval |= __put_user(0, &infop->si_errno);
> 		retval |= __put_user(0, &infop->si_code);
> 		retval |= __put_user(0, &infop->si_pid);
> 		retval |= __put_user(0, &infop->si_uid);
> 		retval |= __put_user(0, &infop->si_status);
> 	}
> is what kernel usually does when filling multiple structure members.

That is certainly fine by me, but shouldn't that be setting retval to
-EFAULT if access_ok fails?  The waitid patch has a couple of other spots
where those several members are filled in and the code uses the several if's.
If one should change I suppose they all should.


Thanks,
Roland